To improve the stability and efficiency of complex
electrical transmission networks requires an everincreasing number of instrument transformers under higher
system voltages. As the size, weight and cost of
classical instrument voltage transformers increase
dramatically with the voltage, there is a growing need
for new kinds of measurement devices. The present project
develops a new measurement alternative based on
mechanical waves rather than magnetic fields. The
transformer consists of a voltage sensor and associated
electronic circuits. The sensor is based on active
ceramic (piezoelectric) material that generate mechanical
waves (emitter). These waves propagate through dielectric
material and are converted to electrical signals in a
receiver. The main areas covered by the project are:
Computer simulations of mechanical wave propagation and
electrical field distribution in several voltage sensor
Development of active ceramic materials adapted to the
sensor requirements of the emitter and receiver.
Design and simulation of electronic circuits that
process the electrical signals form the receiver.
Development of high voltage electrical components
required for the whole measurement instrument.
Laboratory and field prototype tests. These tests will
be carried out in existing facilities for testing
previous generation of instrument transformers.
The new kind of transformer is expected to reduce the
volume (23%), weight (38%), isolating oil (100%) and
manufacturing cost (31%) of the most advanced capacitor
voltage transformer available in the market. In addition,
it does not require maintenance and has lower
environmental impact (no isolating oil and low
Funding SchemeCSC - Cost-sharing contracts
LL14 6HY Wrexham